28086517 has 8 divisors (see below), whose sum is σ = 28875672. Its totient is φ = 27302400.

The previous prime is 28086493. The next prime is 28086523. The reversal of 28086517 is 71568082.

It can be written as a sum of positive squares in 4 ways, for example, as 271441 + 27815076 = 521^2 + 5274^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28086517 - 2¹⁵ = 28053749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11917 + ... + 14077.

It is an arithmetic number, because the mean of its divisors is an integer number (3609459).

Almost surely, 2^28086517 is an apocalyptic number.

It is an amenable number.

28086517 is a deficient number, since it is larger than the sum of its proper divisors (789155).

28086517 is a wasteful number, since it uses less digits than its factorization.

28086517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28086517 is about 5299.6714049080. The cubic root of 28086517 is about 303.9713334292.

The spelling of 28086517 in words is "twenty-eight million, eighty-six thousand, five hundred seventeen".